Typed AST
Every node is a discriminated union — exhaustive switch statements, no runtime surprises.
@veridtools/feel-parserFEEL Lexer & Parser
Tokenize and parse FEEL expressions into a typed AST — zero runtime dependencies.
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Full FEEL Coverage
Arithmetic, logic, if/then/else, for, some/every, filter, path, context, function def & call, instance of, let, pipeline — all 24 node types.
Two Dialects
Parse FEEL expressions or unary-test lists — the grammar adapts automatically.
Known Names
Pass a Set of known multi-word names so the parser assembles "Monthly Salary" into a single Identifier.
Zero Dependencies
Pure TypeScript. No external runtime packages. Works in Node, Deno, Bun, and the browser.
ESM + CJS + IIFE
Ships all three formats plus TypeScript declarations. Drop it into any project.